This was an amazing feature for Reach, and would be amazing for Halo 5 too!
i wish you could go onto halo waypoint for the person you want to download off of. click download map/gametype etc and it downloads to your halo 5 account on xbox so it is on when you get on.
The infinite wisdom of Mr Tom French says… Yes! It’s in the works, but there’s not definitive time on when it will drop
https://twitter.com/pardontomfrench/status/690388049281339396